What’s Vulnerable › Vulnerabilities

CVE-2026-89451: iommu/sva: Set handle->dev before the SVA handle is visible

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/sva: Set handle->dev before the SVA handle is visible iommu_attach_device_pasid() installs the new SVA attach handle in the group PASID lookup before iommu_sva_bind_device() returns. A concurrent bind can therefore find and reuse the same handle after iommu_sva_lock is dropped. handle->dev was initialized after dropping iommu_sva_lock. This leaves a window where a racing bind can return a handle whose dev pointer is still NULL. A subsequent iommu_sva_unbind_device() can then dereference it via handle->dev->iommu_group. Initialize handle->dev before releasing iommu_sva_lock so any visible SVA handle is fully initialized.

Affected products

• Linux kernel: 6.2 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/37a96a30617a4c96f048a5874c00509bc4fe4d85
• https://git.kernel.org/stable/c/530f8f9c3546cb3ebee1b135375aaee08a073ebb
• https://git.kernel.org/stable/c/968e9a1f71140c86dc4092f6b361e997923f3813
• https://git.kernel.org/stable/c/bcffb1c75da8fc9d51168ff9f09d471c26507912
• https://git.kernel.org/stable/c/c4c71368bc5c5b3840590d39b4cfa12d733cadf4

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